<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reference</title>
<style>
.clamp {
  display: flow-root;
  font: 16px / 32px serif;
  background-color: orange;
}
.inner {
  white-space: pre;
  margin: 5px;
  background-color: yellow;
}
</style>

<div class="clamp">
<div class="inner">Line 1
Line 2
Line 3
Line 4…</div>
</div>
